21401202313 has 4 divisors (see below), whose sum is σ = 21659048208. Its totient is φ = 21143356420.

The previous prime is 21401202307. The next prime is 21401202331. The reversal of 21401202313 is 31320210412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21401202313 is a prime.

It is a super-2 number, since 2×21401202313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401202373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128922823 + ... + 128922988.

It is an arithmetic number, because the mean of its divisors is an integer number (5414762052).

Almost surely, 2^21401202313 is an apocalyptic number.

It is an amenable number.

21401202313 is a deficient number, since it is larger than the sum of its proper divisors (257845895).

21401202313 is an equidigital number, since it uses as much as digits as its factorization.

21401202313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257845894.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21401202313 its reverse (31320210412), we get a palindrome (52721412725).

The spelling of 21401202313 in words is "twenty-one billion, four hundred one million, two hundred two thousand, three hundred thirteen".